Fun and cool game, it was very easy to get trapped at the start though, but since i saw it coming I've picked some upgrades that helped making it out of that.
One thing that i always mention, treat the game and the page as two separeted, isolated things from eachother. Basically, the game had no tutorial or control instructions inside, the webpage did. Always try to add some "how to play" or tutorial in-game, do not rely on the page for that.
Cheers ;)